In January, the Finnish mobile giant had announced the availability of the Windows Phone 7.8 update to its older Windows Phone 7-powered devices. The update, which was mostly a cosmetic one, brought along with it a number of Windows 8 feature,s including resizable Live Tiles and a new start screen. It also doubled the total number of themes and accent colours to 20.

Windows Phone 7.8 was expected to be rolled out to Nokia's range of Windows Phone 7 devices, including the Lumia 900, 800, 710, 610 and 510. However, a week ago, Joe Belfiore, the manager of the Windows Phone program, acknowledged on Twitter that Microsoft had encountered a minor issue with the update and was trying to find a fix.

There's no word yet as to when Nokia Lumia owners with devices running Windows Phone 7.5 can expect to get the upgrade.